Small block CHEVY engine ID question

[Abused_Corpse]

Greetings all,when did Chevy stop painting their engines ORANGE?When did the engine stamping pad go from WIDE and NARROW to SQUARED and SMALLER?When did CHEVY start painting their engines BLUE?I also have a CANADIAN built engine in my 1972 Vega.The block stamping says K1002PHC/10054721.Anyone know where to find info on the Canadian engine?What can you tell me?Thanks

 

[63Half-ton461]

Stop orange 1980 ? Blue 1981 ? pad wide 1985-6 ? as for stamped numbers they are tracked down in factory service manuals for the specific year of engine manufacture.